/*
Copyright (c) 1998, 1999 Thai Open Source Software Center Ltd
See the file copying.txt for copying permission.
*/

#ifndef IS_INVALID_CHAR
#define IS_INVALID_CHAR(enc, ptr, n) (0)
#endif

#define INVALID_LEAD_CASE(n, ptr, nextTokPtr) \
    case BT_LEAD ## n: \
      if (end - ptr < n) \
	return XML_TOK_PARTIAL_CHAR; \
      if (IS_INVALID_CHAR(enc, ptr, n)) { \
        *(nextTokPtr) = (ptr); \
        return XML_TOK_INVALID; \
      } \
      ptr += n; \
      break;

#define INVALID_CASES(ptr, nextTokPtr) \
  INVALID_LEAD_CASE(2, ptr, nextTokPtr) \
  INVALID_LEAD_CASE(3, ptr, nextTokPtr) \
  INVALID_LEAD_CASE(4, ptr, nextTokPtr) \
  case BT_NONXML: \
  case BT_MALFORM: \
  case BT_TRAIL: \
    *(nextTokPtr) = (ptr); \
    return XML_TOK_INVALID

#define CHECK_NAME_CASE(n, enc, ptr, end, nextTokPtr) \
   case BT_LEAD ## n: \
     if (end - ptr < n) \
       return XML_TOK_PARTIAL_CHAR; \
     if (!IS_NAME_CHAR(enc, ptr, n)) { \
       *nextTokPtr = ptr; \
       return XML_TOK_INVALID; \
     } \
     ptr += n; \
     break;

#define CHECK_NAME_CASES(enc, ptr, end, nextTokPtr) \
  case BT_NONASCII: \
    if (!IS_NAME_CHAR_MINBPC(enc, ptr)) { \
      *nextTokPtr = ptr; \
      return XML_TOK_INVALID; \
    } \
  case BT_NMSTRT: \
  case BT_HEX: \
  case BT_DIGIT: \
  case BT_NAME: \
  case BT_MINUS: \
    ptr += MINBPC(enc); \
    break; \
  CHECK_NAME_CASE(2, enc, ptr, end, nextTokPtr) \
  CHECK_NAME_CASE(3, enc, ptr, end, nextTokPtr) \
  CHECK_NAME_CASE(4, enc, ptr, end, nextTokPtr)

#define CHECK_NMSTRT_CASE(n, enc, ptr, end, nextTokPtr) \
   case BT_LEAD ## n: \
     if (end - ptr < n) \
       return XML_TOK_PARTIAL_CHAR; \
     if (!IS_NMSTRT_CHAR(enc, ptr, n)) { \
       *nextTokPtr = ptr; \
       return XML_TOK_INVALID; \
     } \
     ptr += n; \
     break;

#define CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr) \
  case BT_NONASCII: \
    if (!IS_NMSTRT_CHAR_MINBPC(enc, ptr)) { \
      *nextTokPtr = ptr; \
      return XML_TOK_INVALID; \
    } \
  case BT_NMSTRT: \
  case BT_HEX: \
    ptr += MINBPC(enc); \
    break; \
  CHECK_NMSTRT_CASE(2, enc, ptr, end, nextTokPtr) \
  CHECK_NMSTRT_CASE(3, enc, ptr, end, nextTokPtr) \
  CHECK_NMSTRT_CASE(4, enc, ptr, end, nextTokPtr)

#ifndef PREFIX
#define PREFIX(ident) ident
#endif

/* ptr points to character following "<!-" */

static
int PREFIX(scanComment)(const ENCODING *enc, const char *ptr, const char *end,
			const char **nextTokPtr)
{
  if (ptr != end) {
    if (!CHAR_MATCHES(enc, ptr, ASCII_MINUS)) {
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
    ptr += MINBPC(enc);
    while (ptr != end) {
      switch (BYTE_TYPE(enc, ptr)) {
          INVALID_CASES(ptr, nextTokPtr);
      case BT_MINUS:
	if ((ptr += MINBPC(enc)) == end)
	  return XML_TOK_PARTIAL;
	if (CHAR_MATCHES(enc, ptr, ASCII_MINUS)) {
	  if ((ptr += MINBPC(enc)) == end)
	    return XML_TOK_PARTIAL;
	  if (!CHAR_MATCHES(enc, ptr, ASCII_GT)) {
	    *nextTokPtr = ptr;
	    return XML_TOK_INVALID;
	  }
	  *nextTokPtr = ptr + MINBPC(enc);
	  return XML_TOK_COMMENT;
	}
	break;
      default:
	ptr += MINBPC(enc);
	break;
      }
    }
  }
  return XML_TOK_PARTIAL;
}

/* ptr points to character following "<!" */

static
int PREFIX(scanDecl)(const ENCODING *enc, const char *ptr, const char *end,
		     const char **nextTokPtr)
{
  if (ptr == end)
    return XML_TOK_PARTIAL;
  switch (BYTE_TYPE(enc, ptr)) {
  case BT_MINUS:
    return PREFIX(scanComment)(enc, ptr + MINBPC(enc), end, nextTokPtr);
  case BT_LSQB:
    *nextTokPtr = ptr + MINBPC(enc);
    return XML_TOK_COND_SECT_OPEN;
  case BT_NMSTRT:
  case BT_HEX:
    ptr += MINBPC(enc);
    break;
  default:
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    case BT_PERCNT:
      if (ptr + MINBPC(enc) == end)
	return XML_TOK_PARTIAL;
      /* don't allow <!ENTITY% foo "whatever"> */
      switch (BYTE_TYPE(enc, ptr + MINBPC(enc))) {
      case BT_S: case BT_CR: case BT_LF: case BT_PERCNT:
	*nextTokPtr = ptr;
	return XML_TOK_INVALID;
      }
      /* fall through */
    case BT_S: case BT_CR: case BT_LF:
      *nextTokPtr = ptr;
      return XML_TOK_DECL_OPEN;
    case BT_NMSTRT:
    case BT_HEX:
      ptr += MINBPC(enc);
      break;
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  return XML_TOK_PARTIAL;
}

static
int PREFIX(checkPiTarget)(const ENCODING * enc ATTR_UNUSED, 
                          const char *     ptr, 
                          const char *     end, 
                          int *            tokPtr)
{
  int upper = 0;
  *tokPtr = XML_TOK_PI;
  if (end - ptr != MINBPC(enc)*3)
    return 1;
  switch (BYTE_TO_ASCII(enc, ptr)) {
  case ASCII_x:
    break;
  case ASCII_X:
    upper = 1;
    break;
  default:
    return 1;
  }
  ptr += MINBPC(enc);
  switch (BYTE_TO_ASCII(enc, ptr)) {
  case ASCII_m:
    break;
  case ASCII_M:
    upper = 1;
    break;
  default:
    return 1;
  }
  ptr += MINBPC(enc);
  switch (BYTE_TO_ASCII(enc, ptr)) {
  case ASCII_l:
    break;
  case ASCII_L:
    upper = 1;
    break;
  default:
    return 1;
  }
  if (upper)
    return 0;
  *tokPtr = XML_TOK_XML_DECL;
  return 1;
}

/* ptr points to character following "<?" */

static
int PREFIX(scanPi)(const ENCODING *enc, const char *ptr, const char *end,
		   const char **nextTokPtr)
{
  int tok;
  const char *target = ptr;
  if (ptr == end)
    return XML_TOK_PARTIAL;
  switch (BYTE_TYPE(enc, ptr)) {
  CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
  default:
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
    case BT_S: case BT_CR: case BT_LF:
      if (!PREFIX(checkPiTarget)(enc, target, ptr, &tok)) {
	*nextTokPtr = ptr;
	return XML_TOK_INVALID;
      }
      ptr += MINBPC(enc);
      while (ptr != end) {
        switch (BYTE_TYPE(enc, ptr)) {
        INVALID_CASES(ptr, nextTokPtr);
	case BT_QUEST:
	  ptr += MINBPC(enc);
	  if (ptr == end)
	    return XML_TOK_PARTIAL;
	  if (CHAR_MATCHES(enc, ptr, ASCII_GT)) {
	    *nextTokPtr = ptr + MINBPC(enc);
	    return tok;
	  }
	  break;
	default:
	  ptr += MINBPC(enc);
	  break;
	}
      }
      return XML_TOK_PARTIAL;
    case BT_QUEST:
      if (!PREFIX(checkPiTarget)(enc, target, ptr, &tok)) {
	*nextTokPtr = ptr;
	return XML_TOK_INVALID;
      }
      ptr += MINBPC(enc);
      if (ptr == end)
	return XML_TOK_PARTIAL;
      if (CHAR_MATCHES(enc, ptr, ASCII_GT)) {
	*nextTokPtr = ptr + MINBPC(enc);
	return tok;
      }
      /* fall through */
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  return XML_TOK_PARTIAL;
}


static
int PREFIX(scanCdataSection)(const ENCODING * enc ATTR_UNUSED, 
                             const char *     ptr, 
                             const char *     end,
                             const char **    nextTokPtr)
{
  static const char CDATA_LSQB[] = { ASCII_C, ASCII_D, ASCII_A, ASCII_T, ASCII_A, ASCII_LSQB };
  int i;
  /* CDATA[ */
  if (end - ptr < 6 * MINBPC(enc))
    return XML_TOK_PARTIAL;
  for (i = 0; i < 6; i++, ptr += MINBPC(enc)) {
    if (!CHAR_MATCHES(enc, ptr, CDATA_LSQB[i])) {
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  *nextTokPtr = ptr;
  return XML_TOK_CDATA_SECT_OPEN;
}

static
int PREFIX(cdataSectionTok)(const ENCODING *enc, const char *ptr, const char *end,
			    const char **nextTokPtr)
{
  if (ptr == end)
    return XML_TOK_NONE;
  if (MINBPC(enc) > 1) {
    size_t n = end - ptr;
    if (n & (MINBPC(enc) - 1)) {
      n &= ~(MINBPC(enc) - 1);
      if (n == 0)
	return XML_TOK_PARTIAL;
      end = ptr + n;
    }
  }
  switch (BYTE_TYPE(enc, ptr)) {
  case BT_RSQB:
    ptr += MINBPC(enc);
    if (ptr == end)
      return XML_TOK_PARTIAL;
    if (!CHAR_MATCHES(enc, ptr, ASCII_RSQB))
      break;
    ptr += MINBPC(enc);
    if (ptr == end)
      return XML_TOK_PARTIAL;
    if (!CHAR_MATCHES(enc, ptr, ASCII_GT)) {
      ptr -= MINBPC(enc);
      break;
    }
    *nextTokPtr = ptr + MINBPC(enc);
    return XML_TOK_CDATA_SECT_CLOSE;
  case BT_CR:
    ptr += MINBPC(enc);
    if (ptr == end)
      return XML_TOK_PARTIAL;
    if (BYTE_TYPE(enc, ptr) == BT_LF)
      ptr += MINBPC(enc);
    *nextTokPtr = ptr;
    return XML_TOK_DATA_NEWLINE;
  case BT_LF:
    *nextTokPtr = ptr + MINBPC(enc);
    return XML_TOK_DATA_NEWLINE;
  INVALID_CASES(ptr, nextTokPtr);
  default:
    ptr += MINBPC(enc);
    break;
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
#define LEAD_CASE(n) \
    case BT_LEAD ## n: \
      if (end - ptr < n || IS_INVALID_CHAR(enc, ptr, n)) { \
	*nextTokPtr = ptr; \
	return XML_TOK_DATA_CHARS; \
      } \
      ptr += n; \
      break;
    LEAD_CASE(2) LEAD_CASE(3) LEAD_CASE(4)
#undef LEAD_CASE
    case BT_NONXML:
    case BT_MALFORM:
    case BT_TRAIL:
    case BT_CR:
    case BT_LF:
    case BT_RSQB:
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    default:
      ptr += MINBPC(enc);
      break;
    }
  }
  *nextTokPtr = ptr;
  return XML_TOK_DATA_CHARS;
}

/* ptr points to character following "</" */

static
int PREFIX(scanEndTag)(const ENCODING *enc, const char *ptr, const char *end,
		       const char **nextTokPtr)
{
  if (ptr == end)
    return XML_TOK_PARTIAL;
  switch (BYTE_TYPE(enc, ptr)) {
  CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
  default:
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
    case BT_S: case BT_CR: case BT_LF:
      for (ptr += MINBPC(enc); ptr != end; ptr += MINBPC(enc)) {
	switch (BYTE_TYPE(enc, ptr)) {
	case BT_S: case BT_CR: case BT_LF:
	  break;
	case BT_GT:
	  *nextTokPtr = ptr + MINBPC(enc);
          return XML_TOK_END_TAG;
	default:
	  *nextTokPtr = ptr;
	  return XML_TOK_INVALID;
	}
      }
      return XML_TOK_PARTIAL;
    case BT_COLON:
      /* no need to check qname syntax here, since end-tag must match exactly */
      ptr += MINBPC(enc);
      break;
    case BT_GT:
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_END_TAG;
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  return XML_TOK_PARTIAL;
}

/* ptr points to character following "&#X" */

static
int PREFIX(scanHexCharRef)(const ENCODING *enc, const char *ptr, const char *end,
			   const char **nextTokPtr)
{
  if (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    case BT_DIGIT:
    case BT_HEX:
      break;
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
    for (ptr += MINBPC(enc); ptr != end; ptr += MINBPC(enc)) {
      switch (BYTE_TYPE(enc, ptr)) {
      case BT_DIGIT:
      case BT_HEX:
	break;
      case BT_SEMI:
	*nextTokPtr = ptr + MINBPC(enc);
	return XML_TOK_CHAR_REF;
      default:
	*nextTokPtr = ptr;
	return XML_TOK_INVALID;
      }
    }
  }
  return XML_TOK_PARTIAL;
}

/* ptr points to character following "&#" */

static
int PREFIX(scanCharRef)(const ENCODING *enc, const char *ptr, const char *end,
			const char **nextTokPtr)
{
  if (ptr != end) {
    if (CHAR_MATCHES(enc, ptr, ASCII_x))
      return PREFIX(scanHexCharRef)(enc, ptr + MINBPC(enc), end, nextTokPtr);
    switch (BYTE_TYPE(enc, ptr)) {
    case BT_DIGIT:
      break;
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
    for (ptr += MINBPC(enc); ptr != end; ptr += MINBPC(enc)) {
      switch (BYTE_TYPE(enc, ptr)) {
      case BT_DIGIT:
	break;
      case BT_SEMI:
	*nextTokPtr = ptr + MINBPC(enc);
	return XML_TOK_CHAR_REF;
      default:
	*nextTokPtr = ptr;
	return XML_TOK_INVALID;
      }
    }
  }
  return XML_TOK_PARTIAL;
}

/* ptr points to character following "&" */

static
int PREFIX(scanRef)(const ENCODING *enc, const char *ptr, const char *end,
		    const char **nextTokPtr)
{
  if (ptr == end)
    return XML_TOK_PARTIAL;
  switch (BYTE_TYPE(enc, ptr)) {
  CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
  case BT_NUM:
    return PREFIX(scanCharRef)(enc, ptr + MINBPC(enc), end, nextTokPtr);
  default:
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
    case BT_SEMI:
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_ENTITY_REF;
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  return XML_TOK_PARTIAL;
}

/* ptr points to character following first character of attribute name */

static
int PREFIX(scanAtts)(const ENCODING *enc, const char *ptr, const char *end,
		     const char **nextTokPtr)
{
  int hadColon = 0;
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
    case BT_COLON:
      if (hadColon) {
	*nextTokPtr = ptr;
	return XML_TOK_INVALID;
      }
      hadColon = 1;
      ptr += MINBPC(enc);
      if (ptr == end)
	return XML_TOK_PARTIAL;
      switch (BYTE_TYPE(enc, ptr)) {
      CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      default:
	*nextTokPtr = ptr;
	return XML_TOK_INVALID;
      }
      break;
    case BT_S: case BT_CR: case BT_LF:
      for (;;) {
	int t;

	ptr += MINBPC(enc);
	if (ptr == end)
	  return XML_TOK_PARTIAL;
	t = BYTE_TYPE(enc, ptr);
	if (t == BT_EQUALS)
	  break;
	switch (t) {
	case BT_S:
	case BT_LF:
	case BT_CR:
	  break;
	default:
	  *nextTokPtr = ptr;
	  return XML_TOK_INVALID;
	}
      }
    /* fall through */
    case BT_EQUALS:
      {
	int open;
	hadColon = 0;
	for (;;) {
	  
	  ptr += MINBPC(enc);
	  if (ptr == end)
	    return XML_TOK_PARTIAL;
	  open = BYTE_TYPE(enc, ptr);
	  if (open == BT_QUOT || open == BT_APOS)
	    break;
	  switch (open) {
	  case BT_S:
	  case BT_LF:
	  case BT_CR:
	    break;
	  default:
	    *nextTokPtr = ptr;
	    return XML_TOK_INVALID;
	  }
	}
	ptr += MINBPC(enc);
	/* in attribute value */
	for (;;) {
	  int t;
	  if (ptr == end)
	    return XML_TOK_PARTIAL;
	  t = BYTE_TYPE(enc, ptr);
	  if (t == open)
	    break;
	  switch (t) {
	  INVALID_CASES(ptr, nextTokPtr);
	  case BT_AMP:
	    {
	      int tok = PREFIX(scanRef)(enc, ptr + MINBPC(enc), end, &ptr);
	      if (tok <= 0) {
		if (tok == XML_TOK_INVALID)
		  *nextTokPtr = ptr;
		return tok;
	      }
	      break;
	    }
	  case BT_LT:
	    *nextTokPtr = ptr;
	    return XML_TOK_INVALID;
	  default:
	    ptr += MINBPC(enc);
	    break;
	  }
	}
	ptr += MINBPC(enc);
	if (ptr == end)
	  return XML_TOK_PARTIAL;
	switch (BYTE_TYPE(enc, ptr)) {
	case BT_S:
	case BT_CR:
	case BT_LF:
	  break;
	case BT_SOL:
	  goto sol;
	case BT_GT:
	  goto gt;
	default:
	  *nextTokPtr = ptr;
	  return XML_TOK_INVALID;
	}
	/* ptr points to closing quote */
	for (;;) {
	  ptr += MINBPC(enc);
	  if (ptr == end)
	    return XML_TOK_PARTIAL;
	  switch (BYTE_TYPE(enc, ptr)) {
	  CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
	  case BT_S: case BT_CR: case BT_LF:
	    continue;
	  case BT_GT:
          gt:
	    *nextTokPtr = ptr + MINBPC(enc);
	    return XML_TOK_START_TAG_WITH_ATTS;
	  case BT_SOL:
          sol:
	    ptr += MINBPC(enc);
	    if (ptr == end)
	      return XML_TOK_PARTIAL;
	    if (!CHAR_MATCHES(enc, ptr, ASCII_GT)) {
	      *nextTokPtr = ptr;
	      return XML_TOK_INVALID;
	    }
	    *nextTokPtr = ptr + MINBPC(enc);
	    return XML_TOK_EMPTY_ELEMENT_WITH_ATTS;
	  default:
	    *nextTokPtr = ptr;
	    return XML_TOK_INVALID;
	  }
	  break;
	}
	break;
      }
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  return XML_TOK_PARTIAL;
}

/* ptr points to character following "<" */

static
int PREFIX(scanLt)(const ENCODING *enc, const char *ptr, const char *end,
		   const char **nextTokPtr)
{
  int hadColon;
  if (ptr == end)
    return XML_TOK_PARTIAL;
  switch (BYTE_TYPE(enc, ptr)) {
  CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
  case BT_EXCL:
    if ((ptr += MINBPC(enc)) == end)
      return XML_TOK_PARTIAL;
    switch (BYTE_TYPE(enc, ptr)) {
    case BT_MINUS:
      return PREFIX(scanComment)(enc, ptr + MINBPC(enc), end, nextTokPtr);
    case BT_LSQB:
      return PREFIX(scanCdataSection)(enc, ptr + MINBPC(enc), end, nextTokPtr);
    }
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  case BT_QUEST:
    return PREFIX(scanPi)(enc, ptr + MINBPC(enc), end, nextTokPtr);
  case BT_SOL:
    return PREFIX(scanEndTag)(enc, ptr + MINBPC(enc), end, nextTokPtr);
  default:
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  }
  hadColon = 0;
  /* we have a start-tag */
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
    case BT_COLON:
      if (hadColon) {
	*nextTokPtr = ptr;
	return XML_TOK_INVALID;
      }
      hadColon = 1;
      ptr += MINBPC(enc);
      if (ptr == end)
	return XML_TOK_PARTIAL;
      switch (BYTE_TYPE(enc, ptr)) {
      CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      default:
        *nextTokPtr = ptr;
        return XML_TOK_INVALID;
      }
      break;
    case BT_S: case BT_CR: case BT_LF:
      {
        ptr += MINBPC(enc);
	while (ptr != end) {
	  switch (BYTE_TYPE(enc, ptr)) {
	  CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
	  case BT_GT:
	    goto gt;
	  case BT_SOL:
	    goto sol;
	  case BT_S: case BT_CR: case BT_LF:
	    ptr += MINBPC(enc);
	    continue;
	  default:
	    *nextTokPtr = ptr;
	    return XML_TOK_INVALID;
	  }
	  return PREFIX(scanAtts)(enc, ptr, end, nextTokPtr);
	}
	return XML_TOK_PARTIAL;
      }
    case BT_GT:
    gt:
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_START_TAG_NO_ATTS;
    case BT_SOL:
    sol:
      ptr += MINBPC(enc);
      if (ptr == end)
	return XML_TOK_PARTIAL;
      if (!CHAR_MATCHES(enc, ptr, ASCII_GT)) {
	*nextTokPtr = ptr;
	return XML_TOK_INVALID;
      }
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_EMPTY_ELEMENT_NO_ATTS;
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  return XML_TOK_PARTIAL;
}



#define LEAD_CASE(n) \
    case BT_LEAD ## n: \
        if (end - ptr < n || IS_INVALID_CHAR(enc, ptr, n)) { \
            *nextTokPtr = ptr; \
            return XML_TOK_DATA_CHARS; \
        } \
        ptr += n; \
        break



static void
PREFIX(chopToWholeCharacters)(const char *  const inputStart,
                              const char *  const inputEnd,
                              const char ** const choppedEndP) {

    if (MINBPC(enc) > 1) {
        size_t const length = inputEnd - inputStart;
        if (length & (MINBPC(enc) - 1)) {
            size_t const roundedLen = length & ~(MINBPC(enc) - 1);
            *choppedEndP = inputStart + roundedLen;
        } else
            *choppedEndP = inputEnd;
    } else
        *choppedEndP = inputEnd;
}



static void
PREFIX(processBtRsqb)(const ENCODING * const enc ATTR_UNUSED,
                      const char *     const start,
                      const char *     const end,
                      unsigned int *   const countP,
                      bool *           const invalidP) {

    if (start + MINBPC(enc) < end) {
        if (!CHAR_MATCHES(enc, start + MINBPC(enc), ASCII_RSQB)) {
            *countP = MINBPC(enc);
            *invalidP = false;
        } else {
            if (start + 2*MINBPC(enc) < end) {
                if (!CHAR_MATCHES(enc, start + 2*MINBPC(enc), ASCII_GT)) {
                    *countP = MINBPC(enc);
                    *invalidP = false;
                } else {
                    *countP = 2 * MINBPC(enc);
                    *invalidP = true;
                }
            } else {
                *countP   = 0;
                *invalidP = false;
            }
        }
    } else {
        *countP = 0;
        *invalidP = false;
    }
}



static int
PREFIX(contentTok)(const ENCODING * const enc,
                   const char *     const inputStart,
                   const char *     const inputEnd,
                   const char **    const nextTokPtr) {
/*----------------------------------------------------------------------------
   Parse off a token from the string that starts at 'inputStart' and ends at
   'inputEnd'.  Return the class of that token.

   Return *nextTokPtr pointing just after the parsed-off token in the string.

   Sometimes, there is no token we can parse, so our return value is a
   disposition code indicating that situation and *nextTokPtr points to the
   beginning of the string.
-----------------------------------------------------------------------------*/
    if (inputEnd == inputStart) {
        *nextTokPtr = inputStart;
        return XML_TOK_NONE;
    } else {
        const char * ptr;
        const char * end;
            /* The virtual end of the string; we look at only whole
               characters; e.g. if there are 2 bytes per character and the
               buffer is 9 bytes, we look at only the first 8 and 'end' points
               after the 8th byte.
            */
        PREFIX(chopToWholeCharacters)(inputStart, inputEnd, &end);

        if (end == inputStart) {
            *nextTokPtr = inputStart;
            return XML_TOK_PARTIAL;
        }
        ptr = inputStart;  /* Start at the beginning */

        switch (BYTE_TYPE(enc, ptr)) {
        case BT_LT:
            return PREFIX(scanLt)(enc, ptr + MINBPC(enc), end, nextTokPtr);
        case BT_AMP:
            return PREFIX(scanRef)(enc, ptr + MINBPC(enc), end, nextTokPtr);
        case BT_CR:
            ptr += MINBPC(enc);
            if (ptr == end)
                return XML_TOK_TRAILING_CR;
            if (BYTE_TYPE(enc, ptr) == BT_LF)
                ptr += MINBPC(enc);
            *nextTokPtr = ptr;
            return XML_TOK_DATA_NEWLINE;
        case BT_LF:
            *nextTokPtr = ptr + MINBPC(enc);
            return XML_TOK_DATA_NEWLINE;
        case BT_RSQB:
            ptr += MINBPC(enc);
            if (ptr == end)
                return XML_TOK_TRAILING_RSQB;
            if (!CHAR_MATCHES(enc, ptr, ASCII_RSQB))
                break;
            ptr += MINBPC(enc);
            if (ptr == end)
                return XML_TOK_TRAILING_RSQB;
            if (!CHAR_MATCHES(enc, ptr, ASCII_GT)) {
                ptr -= MINBPC(enc);
                break;
            }
            *nextTokPtr = ptr;
            return XML_TOK_INVALID;
            INVALID_CASES(ptr, nextTokPtr);
        default:
            ptr += MINBPC(enc);
            break;
        }
        while (ptr < end) {
            switch (BYTE_TYPE(enc, ptr)) {
                LEAD_CASE(2);
                LEAD_CASE(3);
                LEAD_CASE(4);
            case BT_RSQB: {
                bool invalid;
                unsigned int count;
                PREFIX(processBtRsqb)(enc, ptr, end, &count, &invalid);
                ptr += count;
                if (invalid) {
                    *nextTokPtr = ptr;
                    return XML_TOK_INVALID;
                }
            }
            /* fall through */
            case BT_AMP:
            case BT_LT:
            case BT_NONXML:
            case BT_MALFORM:
            case BT_TRAIL:
            case BT_CR:
            case BT_LF:
                *nextTokPtr = ptr;
                return XML_TOK_DATA_CHARS;
            default:
                ptr += MINBPC(enc);
                break;
            }
        }
        *nextTokPtr = ptr;
        return XML_TOK_DATA_CHARS;
    }
}

#undef LEAD_CASE



/* ptr points to character following "%" */

static
int PREFIX(scanPercent)(const ENCODING *enc, const char *ptr, const char *end,
			const char **nextTokPtr)
{
  if (ptr == end)
    return XML_TOK_PARTIAL;
  switch (BYTE_TYPE(enc, ptr)) {
  CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
  case BT_S: case BT_LF: case BT_CR: case BT_PERCNT:
    *nextTokPtr = ptr;
    return XML_TOK_PERCENT;
  default:
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
    case BT_SEMI:
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_PARAM_ENTITY_REF;
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  return XML_TOK_PARTIAL;
}

static
int PREFIX(scanPoundName)(const ENCODING *enc, const char *ptr, const char *end,
			  const char **nextTokPtr)
{
  if (ptr == end)
    return XML_TOK_PARTIAL;
  switch (BYTE_TYPE(enc, ptr)) {
  CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
  default:
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
    case BT_CR: case BT_LF: case BT_S:
    case BT_RPAR: case BT_GT: case BT_PERCNT: case BT_VERBAR:
      *nextTokPtr = ptr;
      return XML_TOK_POUND_NAME;
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  return -XML_TOK_POUND_NAME;
}

static
int PREFIX(scanLit)(int open, const ENCODING *enc,
		    const char *ptr, const char *end,
		    const char **nextTokPtr)
{
  while (ptr != end) {
    int t = BYTE_TYPE(enc, ptr);
    switch (t) {
    INVALID_CASES(ptr, nextTokPtr);
    case BT_QUOT:
    case BT_APOS:
      ptr += MINBPC(enc);
      if (t != open)
	break;
      if (ptr == end)
	return -XML_TOK_LITERAL;
      *nextTokPtr = ptr;
      switch (BYTE_TYPE(enc, ptr)) {
      case BT_S: case BT_CR: case BT_LF:
      case BT_GT: case BT_PERCNT: case BT_LSQB:
	return XML_TOK_LITERAL;
      default:
	return XML_TOK_INVALID;
      }
    default:
      ptr += MINBPC(enc);
      break;
    }
  }
  return XML_TOK_PARTIAL;
}

static
int PREFIX(prologTok)(const ENCODING *enc, const char *ptr, const char *end,
		      const char **nextTokPtr)
{
  int tok;
  if (ptr == end)
    return XML_TOK_NONE;
  if (MINBPC(enc) > 1) {
    size_t n = end - ptr;
    if (n & (MINBPC(enc) - 1)) {
      n &= ~(MINBPC(enc) - 1);
      if (n == 0)
	return XML_TOK_PARTIAL;
      end = ptr + n;
    }
  }
  switch (BYTE_TYPE(enc, ptr)) {
  case BT_QUOT:
    return PREFIX(scanLit)(BT_QUOT, enc, ptr + MINBPC(enc), end, nextTokPtr);
  case BT_APOS:
    return PREFIX(scanLit)(BT_APOS, enc, ptr + MINBPC(enc), end, nextTokPtr);
  case BT_LT:
    {
      ptr += MINBPC(enc);
      if (ptr == end)
	return XML_TOK_PARTIAL;
      switch (BYTE_TYPE(enc, ptr)) {
      case BT_EXCL:
	return PREFIX(scanDecl)(enc, ptr + MINBPC(enc), end, nextTokPtr);
      case BT_QUEST:
	return PREFIX(scanPi)(enc, ptr + MINBPC(enc), end, nextTokPtr);
      case BT_NMSTRT:
      case BT_HEX:
      case BT_NONASCII:
      case BT_LEAD2:
      case BT_LEAD3:
      case BT_LEAD4:
	*nextTokPtr = ptr - MINBPC(enc);
	return XML_TOK_INSTANCE_START;
      }
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  case BT_CR:
    if (ptr + MINBPC(enc) == end)
      return -XML_TOK_PROLOG_S;
    /* fall through */
  case BT_S: case BT_LF:
    for (;;) {
      ptr += MINBPC(enc);
      if (ptr == end)
	break;
      switch (BYTE_TYPE(enc, ptr)) {
      case BT_S: case BT_LF:
	break;
      case BT_CR:
	/* don't split CR/LF pair */
	if (ptr + MINBPC(enc) != end)
	  break;
	/* fall through */
      default:
	*nextTokPtr = ptr;
	return XML_TOK_PROLOG_S;
      }
    }
    *nextTokPtr = ptr;
    return XML_TOK_PROLOG_S;
  case BT_PERCNT:
    return PREFIX(scanPercent)(enc, ptr + MINBPC(enc), end, nextTokPtr);
  case BT_COMMA:
    *nextTokPtr = ptr + MINBPC(enc);
    return XML_TOK_COMMA;
  case BT_LSQB:
    *nextTokPtr = ptr + MINBPC(enc);
    return XML_TOK_OPEN_BRACKET;
  case BT_RSQB:
    ptr += MINBPC(enc);
    if (ptr == end)
      return -XML_TOK_CLOSE_BRACKET;
    if (CHAR_MATCHES(enc, ptr, ASCII_RSQB)) {
      if (ptr + MINBPC(enc) == end)
	return XML_TOK_PARTIAL;
      if (CHAR_MATCHES(enc, ptr + MINBPC(enc), ASCII_GT)) {
	*nextTokPtr = ptr + 2*MINBPC(enc);
	return XML_TOK_COND_SECT_CLOSE;
      }
    }
    *nextTokPtr = ptr;
    return XML_TOK_CLOSE_BRACKET;
  case BT_LPAR:
    *nextTokPtr = ptr + MINBPC(enc);
    return XML_TOK_OPEN_PAREN;
  case BT_RPAR:
    ptr += MINBPC(enc);
    if (ptr == end)
      return -XML_TOK_CLOSE_PAREN;
    switch (BYTE_TYPE(enc, ptr)) {
    case BT_AST:
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_CLOSE_PAREN_ASTERISK;
    case BT_QUEST:
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_CLOSE_PAREN_QUESTION;
    case BT_PLUS:
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_CLOSE_PAREN_PLUS;
    case BT_CR: case BT_LF: case BT_S:
    case BT_GT: case BT_COMMA: case BT_VERBAR:
    case BT_RPAR:
      *nextTokPtr = ptr;
      return XML_TOK_CLOSE_PAREN;
    }
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  case BT_VERBAR:
    *nextTokPtr = ptr + MINBPC(enc);
    return XML_TOK_OR;
  case BT_GT:
    *nextTokPtr = ptr + MINBPC(enc);
    return XML_TOK_DECL_CLOSE;
  case BT_NUM:
    return PREFIX(scanPoundName)(enc, ptr + MINBPC(enc), end, nextTokPtr);
#define LEAD_CASE(n) \
  case BT_LEAD ## n: \
    if (end - ptr < n) \
      return XML_TOK_PARTIAL_CHAR; \
    if (IS_NMSTRT_CHAR(enc, ptr, n)) { \
      ptr += n; \
      tok = XML_TOK_NAME; \
      break; \
    } \
    if (IS_NAME_CHAR(enc, ptr, n)) { \
      ptr += n; \
      tok = XML_TOK_NMTOKEN; \
      break; \
    } \
    *nextTokPtr = ptr; \
    return XML_TOK_INVALID;
    LEAD_CASE(2) LEAD_CASE(3) LEAD_CASE(4)
#undef LEAD_CASE
  case BT_NMSTRT:
  case BT_HEX:
    tok = XML_TOK_NAME;
    ptr += MINBPC(enc);
    break;
  case BT_DIGIT:
  case BT_NAME:
  case BT_MINUS:
  case BT_COLON:
    tok = XML_TOK_NMTOKEN;
    ptr += MINBPC(enc);
    break;
  case BT_NONASCII:
    if (IS_NMSTRT_CHAR_MINBPC(enc, ptr)) {
      ptr += MINBPC(enc);
      tok = XML_TOK_NAME;
      break;
    }
    if (IS_NAME_CHAR_MINBPC(enc, ptr)) {
      ptr += MINBPC(enc);
      tok = XML_TOK_NMTOKEN;
      break;
    }
    /* fall through */
  default:
    *nextTokPtr = ptr;
    return XML_TOK_INVALID;
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
    case BT_GT: case BT_RPAR: case BT_COMMA:
    case BT_VERBAR: case BT_LSQB: case BT_PERCNT:
    case BT_S: case BT_CR: case BT_LF:
      *nextTokPtr = ptr;
      return tok;
    case BT_COLON:
      ptr += MINBPC(enc);
      switch (tok) {
      case XML_TOK_NAME:
	if (ptr == end)
	  return XML_TOK_PARTIAL;
	tok = XML_TOK_PREFIXED_NAME;
	switch (BYTE_TYPE(enc, ptr)) {
	CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
	default:
	  tok = XML_TOK_NMTOKEN;
	  break;
	}
	break;
      case XML_TOK_PREFIXED_NAME:
	tok = XML_TOK_NMTOKEN;
	break;
      }
      break;
    case BT_PLUS:
      if (tok == XML_TOK_NMTOKEN)  {
	*nextTokPtr = ptr;
	return XML_TOK_INVALID;
      }
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_NAME_PLUS;
    case BT_AST:
      if (tok == XML_TOK_NMTOKEN)  {
	*nextTokPtr = ptr;
	return XML_TOK_INVALID;
      }
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_NAME_ASTERISK;
    case BT_QUEST:
      if (tok == XML_TOK_NMTOKEN)  {
	*nextTokPtr = ptr;
	return XML_TOK_INVALID;
      }
      *nextTokPtr = ptr + MINBPC(enc);
      return XML_TOK_NAME_QUESTION;
    default:
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    }
  }
  return -tok;
}

static
int PREFIX(attributeValueTok)(const ENCODING *enc, const char *ptr, const char *end,
			      const char **nextTokPtr)
{
  const char *start;
  if (ptr == end)
    return XML_TOK_NONE;
  start = ptr;
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
#define LEAD_CASE(n) \
    case BT_LEAD ## n: ptr += n; break;
    LEAD_CASE(2) LEAD_CASE(3) LEAD_CASE(4)
#undef LEAD_CASE
    case BT_AMP:
      if (ptr == start)
	return PREFIX(scanRef)(enc, ptr + MINBPC(enc), end, nextTokPtr);
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    case BT_LT:
      /* this is for inside entity references */
      *nextTokPtr = ptr;
      return XML_TOK_INVALID;
    case BT_LF:
      if (ptr == start) {
	*nextTokPtr = ptr + MINBPC(enc);
	return XML_TOK_DATA_NEWLINE;
      }
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    case BT_CR:
      if (ptr == start) {
	ptr += MINBPC(enc);
	if (ptr == end)
	  return XML_TOK_TRAILING_CR;
	if (BYTE_TYPE(enc, ptr) == BT_LF)
	  ptr += MINBPC(enc);
	*nextTokPtr = ptr;
	return XML_TOK_DATA_NEWLINE;
      }
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    case BT_S:
      if (ptr == start) {
	*nextTokPtr = ptr + MINBPC(enc);
	return XML_TOK_ATTRIBUTE_VALUE_S;
      }
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    default:
      ptr += MINBPC(enc);
      break;
    }
  }
  *nextTokPtr = ptr;
  return XML_TOK_DATA_CHARS;
}

static
int PREFIX(entityValueTok)(const ENCODING *enc, const char *ptr, const char *end,
			   const char **nextTokPtr)
{
  const char *start;
  if (ptr == end)
    return XML_TOK_NONE;
  start = ptr;
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
#define LEAD_CASE(n) \
    case BT_LEAD ## n: ptr += n; break;
    LEAD_CASE(2) LEAD_CASE(3) LEAD_CASE(4)
#undef LEAD_CASE
    case BT_AMP:
      if (ptr == start)
	return PREFIX(scanRef)(enc, ptr + MINBPC(enc), end, nextTokPtr);
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    case BT_PERCNT:
      if (ptr == start)
	return PREFIX(scanPercent)(enc, ptr + MINBPC(enc), end, nextTokPtr);
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    case BT_LF:
      if (ptr == start) {
	*nextTokPtr = ptr + MINBPC(enc);
	return XML_TOK_DATA_NEWLINE;
      }
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    case BT_CR:
      if (ptr == start) {
	ptr += MINBPC(enc);
	if (ptr == end)
	  return XML_TOK_TRAILING_CR;
	if (BYTE_TYPE(enc, ptr) == BT_LF)
	  ptr += MINBPC(enc);
	*nextTokPtr = ptr;
	return XML_TOK_DATA_NEWLINE;
      }
      *nextTokPtr = ptr;
      return XML_TOK_DATA_CHARS;
    default:
      ptr += MINBPC(enc);
      break;
    }
  }
  *nextTokPtr = ptr;
  return XML_TOK_DATA_CHARS;
}



static
int PREFIX(ignoreSectionTok)(const ENCODING *enc, const char *ptr, const char *end,
			     const char **nextTokPtr)
{
  int level = 0;
  if (MINBPC(enc) > 1) {
    size_t n = end - ptr;
    if (n & (MINBPC(enc) - 1)) {
      n &= ~(MINBPC(enc) - 1);
      end = ptr + n;
    }
  }
  while (ptr != end) {
    switch (BYTE_TYPE(enc, ptr)) {
    INVALID_CASES(ptr, nextTokPtr);
    case BT_LT:
      if ((ptr += MINBPC(enc)) == end)
	return XML_TOK_PARTIAL;
      if (CHAR_MATCHES(enc, ptr, ASCII_EXCL)) {
	if ((ptr += MINBPC(enc)) == end)
	  return XML_TOK_PARTIAL;
	if (CHAR_MATCHES(enc, ptr, ASCII_LSQB)) {
	  ++level;
	  ptr += MINBPC(enc);
	}
      }
      break;
    case BT_RSQB:
      if ((ptr += MINBPC(enc)) == end)
	return XML_TOK_PARTIAL;
      if (CHAR_MATCHES(enc, ptr, ASCII_RSQB)) {
	if ((ptr += MINBPC(enc)) == end)
	  return XML_TOK_PARTIAL;
	if (CHAR_MATCHES(enc, ptr, ASCII_GT)) {
	  ptr += MINBPC(enc);
	  if (level == 0) {
	    *nextTokPtr = ptr;
	    return XML_TOK_IGNORE_SECT;
	  }
	  --level;
	}
      }
      break;
    default:
      ptr += MINBPC(enc);
      break;
    }
  }
  return XML_TOK_PARTIAL;
}



static
int PREFIX(isPublicId)(const ENCODING *enc, const char *ptr, const char *end,
		       const char **badPtr)
{
  ptr += MINBPC(enc);
  end -= MINBPC(enc);
  for (; ptr != end; ptr += MINBPC(enc)) {
    switch (BYTE_TYPE(enc, ptr)) {
    case BT_DIGIT:
    case BT_HEX:
    case BT_MINUS:
    case BT_APOS:
    case BT_LPAR:
    case BT_RPAR:
    case BT_PLUS:
    case BT_COMMA:
    case BT_SOL:
    case BT_EQUALS:
    case BT_QUEST:
    case BT_CR:
    case BT_LF:
    case BT_SEMI:
    case BT_EXCL:
    case BT_AST:
    case BT_PERCNT:
    case BT_NUM:
    case BT_COLON:
      break;
    case BT_S:
      if (CHAR_MATCHES(enc, ptr, ASCII_TAB)) {
	*badPtr = ptr;
	return 0;
      }
      break;
    case BT_NAME:
    case BT_NMSTRT:
      if (!(BYTE_TO_ASCII(enc, ptr) & ~0x7f))
	break;
    default:
      switch (BYTE_TO_ASCII(enc, ptr)) {
      case 0x24: /* $ */
      case 0x40: /* @ */
	break;
      default:
	*badPtr = ptr;
	return 0;
      }
      break;
    }
  }
  return 1;
}

/* This must only be called for a well-formed start-tag or empty element tag.
Returns the number of attributes.  Pointers to the first attsMax attributes 
are stored in atts. */

static
int PREFIX(getAtts)(const ENCODING *enc, const char *ptr,
		    int attsMax, ATTRIBUTE *atts)
{
  enum { other, inName, inValue } state = inName;
  int nAtts = 0;
  int open = 0; /* defined when state == inValue;
		   initialization just to shut up compilers */

  for (ptr += MINBPC(enc);; ptr += MINBPC(enc)) {
    switch (BYTE_TYPE(enc, ptr)) {
#define START_NAME \
      if (state == other) { \
	if (nAtts < attsMax) { \
	  atts[nAtts].name = ptr; \
	  atts[nAtts].normalized = 1; \
	} \
	state = inName; \
      }
#define LEAD_CASE(n) \
    case BT_LEAD ## n: START_NAME ptr += (n - MINBPC(enc)); break;
    LEAD_CASE(2) LEAD_CASE(3) LEAD_CASE(4)
#undef LEAD_CASE
    case BT_NONASCII:
    case BT_NMSTRT:
    case BT_HEX:
      START_NAME
      break;
#undef START_NAME
    case BT_QUOT:
      if (state != inValue) {
	if (nAtts < attsMax)
	  atts[nAtts].valuePtr = ptr + MINBPC(enc);
        state = inValue;
        open = BT_QUOT;
      }
      else if (open == BT_QUOT) {
        state = other;
	if (nAtts < attsMax)
	  atts[nAtts].valueEnd = ptr;
	nAtts++;
      }
      break;
    case BT_APOS:
      if (state != inValue) {
	if (nAtts < attsMax)
	  atts[nAtts].valuePtr = ptr + MINBPC(enc);
        state = inValue;
        open = BT_APOS;
      }
      else if (open == BT_APOS) {
        state = other;
	if (nAtts < attsMax)
	  atts[nAtts].valueEnd = ptr;
	nAtts++;
      }
      break;
    case BT_AMP:
      if (nAtts < attsMax)
	atts[nAtts].normalized = 0;
      break;
    case BT_S:
      if (state == inName)
        state = other;
      else if (state == inValue
	       && nAtts < attsMax
	       && atts[nAtts].normalized
	       && (ptr == atts[nAtts].valuePtr
		   || BYTE_TO_ASCII(enc, ptr) != ASCII_SPACE
		   || BYTE_TO_ASCII(enc, ptr + MINBPC(enc)) == ASCII_SPACE
	           || BYTE_TYPE(enc, ptr + MINBPC(enc)) == open))
	atts[nAtts].normalized = 0;
      break;
    case BT_CR: case BT_LF:
      /* This case ensures that the first attribute name is counted
         Apart from that we could just change state on the quote. */
      if (state == inName)
        state = other;
      else if (state == inValue && nAtts < attsMax)
	atts[nAtts].normalized = 0;
      break;
    case BT_GT:
    case BT_SOL:
      if (state != inValue)
	return nAtts;
      break;
    default:
      break;
    }
  }
  /* not reached */
}

static
int PREFIX(charRefNumber)(const ENCODING *enc ATTR_UNUSED, const char *ptr)
{
  int result = 0;
  /* skip &# */
  ptr += 2*MINBPC(enc);
  if (CHAR_MATCHES(enc, ptr, ASCII_x)) {
    for (ptr += MINBPC(enc); !CHAR_MATCHES(enc, ptr, ASCII_SEMI); ptr += MINBPC(enc)) {
      int c = BYTE_TO_ASCII(enc, ptr);
      switch (c) {
      case ASCII_0: case ASCII_1: case ASCII_2: case ASCII_3: case ASCII_4:
      case ASCII_5: case ASCII_6: case ASCII_7: case ASCII_8: case ASCII_9:
	result <<= 4;
	result |= (c - ASCII_0);
	break;
      case ASCII_A: case ASCII_B: case ASCII_C: case ASCII_D: case ASCII_E: case ASCII_F:
	result <<= 4;
	result += 10 + (c - ASCII_A);
	break;
      case ASCII_a: case ASCII_b: case ASCII_c: case ASCII_d: case ASCII_e: case ASCII_f:
	result <<= 4;
	result += 10 + (c - ASCII_a);
	break;
      }
      if (result >= 0x110000)
	return -1;
    }
  }
  else {
    for (; !CHAR_MATCHES(enc, ptr, ASCII_SEMI); ptr += MINBPC(enc)) {
      int c = BYTE_TO_ASCII(enc, ptr);
      result *= 10;
      result += (c - ASCII_0);
      if (result >= 0x110000)
	return -1;
    }
  }
  return checkCharRefNumber(result);
}

static
int PREFIX(predefinedEntityName)(const ENCODING * enc ATTR_UNUSED, 
                                 const char *     ptr, 
                                 const char *     end)
{
  switch ((end - ptr)/MINBPC(enc)) {
  case 2:
    if (CHAR_MATCHES(enc, ptr + MINBPC(enc), ASCII_t)) {
      switch (BYTE_TO_ASCII(enc, ptr)) {
      case ASCII_l:
	return ASCII_LT;
      case ASCII_g:
	return ASCII_GT;
      }
    }
    break;
  case 3:
    if (CHAR_MATCHES(enc, ptr, ASCII_a)) {
      ptr += MINBPC(enc);
      if (CHAR_MATCHES(enc, ptr, ASCII_m)) {
	ptr += MINBPC(enc);
	if (CHAR_MATCHES(enc, ptr, ASCII_p))
	  return ASCII_AMP;
      }
    }
    break;
  case 4:
    switch (BYTE_TO_ASCII(enc, ptr)) {
    case ASCII_q:
      ptr += MINBPC(enc);
      if (CHAR_MATCHES(enc, ptr, ASCII_u)) {
	ptr += MINBPC(enc);
	if (CHAR_MATCHES(enc, ptr, ASCII_o)) {
	  ptr += MINBPC(enc);
  	  if (CHAR_MATCHES(enc, ptr, ASCII_t))
	    return ASCII_QUOT;
	}
      }
      break;
    case ASCII_a:
      ptr += MINBPC(enc);
      if (CHAR_MATCHES(enc, ptr, ASCII_p)) {
	ptr += MINBPC(enc);
	if (CHAR_MATCHES(enc, ptr, ASCII_o)) {
	  ptr += MINBPC(enc);
  	  if (CHAR_MATCHES(enc, ptr, ASCII_s))
	    return ASCII_APOS;
	}
      }
      break;
    }
  }
  return 0;
}

static
int PREFIX(sameName)(const ENCODING *enc, const char *ptr1, const char *ptr2)
{
  for (;;) {
    switch (BYTE_TYPE(enc, ptr1)) {
#define LEAD_CASE(n) \
    case BT_LEAD ## n: \
      if (*ptr1++ != *ptr2++) \
	return 0;
    LEAD_CASE(4) LEAD_CASE(3) LEAD_CASE(2)
#undef LEAD_CASE
      /* fall through */
      if (*ptr1++ != *ptr2++)
	return 0;
      break;
    case BT_NONASCII:
    case BT_NMSTRT:
    case BT_COLON:
    case BT_HEX:
    case BT_DIGIT:
    case BT_NAME:
    case BT_MINUS:
      if (*ptr2++ != *ptr1++)
	return 0;
      if (MINBPC(enc) > 1) {
	if (*ptr2++ != *ptr1++)
	  return 0;
	if (MINBPC(enc) > 2) {
	  if (*ptr2++ != *ptr1++)
	    return 0;
          if (MINBPC(enc) > 3) {
	    if (*ptr2++ != *ptr1++)
      	      return 0;
	  }
	}
      }
      break;
    default:
      if (MINBPC(enc) == 1 && *ptr1 == *ptr2)
	return 1;
      switch (BYTE_TYPE(enc, ptr2)) {
      case BT_LEAD2:
      case BT_LEAD3:
      case BT_LEAD4:
      case BT_NONASCII:
      case BT_NMSTRT:
      case BT_COLON:
      case BT_HEX:
      case BT_DIGIT:
      case BT_NAME:
      case BT_MINUS:
	return 0;
      default:
	return 1;
      }
    }
  }
  /* not reached */
}

static
int PREFIX(nameMatchesAscii)(const ENCODING * enc ATTR_UNUSED, 
                             const char *     ptr1,
                             const char *     end1, 
                             const char *     ptr2)
{
  for (; *ptr2; ptr1 += MINBPC(enc), ptr2++) {
    if (ptr1 == end1)
      return 0;
    if (!CHAR_MATCHES(enc, ptr1, *ptr2))
      return 0;
  }
  return ptr1 == end1;
}



#define LEAD_CASE(n) case BT_LEAD ## n: ptr += n; break

static size_t
PREFIX(nameLength)(const ENCODING * const enc,
                   const char *     const start) {

    const char * ptr;

    for (ptr = start;;) {
        switch (BYTE_TYPE(enc, ptr)) {
        LEAD_CASE(2);
        LEAD_CASE(3);
        LEAD_CASE(4);
        case BT_NONASCII:
        case BT_NMSTRT:
        case BT_COLON:
        case BT_HEX:
        case BT_DIGIT:
        case BT_NAME:
        case BT_MINUS:
            ptr += MINBPC(enc);
            break;
        default:
            return ptr - start;
        }
    }
}
#undef LEAD_CASE



static
const char *PREFIX(skipS)(const ENCODING *enc, const char *ptr)
{
  for (;;) {
    switch (BYTE_TYPE(enc, ptr)) {
    case BT_LF:
    case BT_CR:
    case BT_S:
      ptr += MINBPC(enc);
      break;
    default:
      return ptr;
    }
  }
}



#define LEAD_CASE(n) \
    case BT_LEAD ## n: \
      ptr += n; \
      break

static void
PREFIX(updatePosition)(const ENCODING * const enc,
                       const char *     const start,
                       const char *     const end,
                       POSITION *       const posP) {

    const char * ptr;

    for (ptr = start; ptr < end;) {
        switch (BYTE_TYPE(enc, ptr)) {
        LEAD_CASE(2);
        LEAD_CASE(3);
        LEAD_CASE(4);
        case BT_LF:
            posP->columnNumber = (unsigned)-1;
            ++posP->lineNumber;
            ptr += MINBPC(enc);
            break;
        case BT_CR:
            ++posP->lineNumber;
            ptr += MINBPC(enc);
            if (ptr != end && BYTE_TYPE(enc, ptr) == BT_LF)
                ptr += MINBPC(enc);
            posP->columnNumber = (unsigned)-1;
            break;
        default:
            ptr += MINBPC(enc);
            break;
        }
        ++posP->columnNumber;
    }
}

#undef LEAD_CASE


#undef DO_LEAD_CASE
#undef MULTIBYTE_CASES
#undef INVALID_CASES
#undef CHECK_NAME_CASE
#undef CHECK_NAME_CASES
#undef CHECK_NMSTRT_CASE
#undef CHECK_NMSTRT_CASES
